Got a glimpse of clear sky on Saturday night. Added another 4hrs 30mins luminance. Reprocessed from scratch, taking into account feedback so far. No satellite trail. No black rings around stars. Identified and removed several artifacts in the red channel. The artifacts do seem to be related to residual images from previous shots. The new version is a little cleaner, and slightly less pushed. Sadly, the streaks from gamma corona australis are even more obvious than before.
Full sized image with additional 4hrs30 Luminance here